Apriori算法详解及java代码实现

//从候选集中找到符合支持度的频繁集项

itemkFcMap.clear();

for(String candidate:ccKeySet){

Integer count=candidateCollection.get(candidate);

if(count>=SUPPORT){

itemkFcMap.put(candidate, count);

}

}

//合并所有频繁集

frequentCollectionMap.putAll(itemkFcMap);

}

return frequentCollectionMap;

}

private Map<String,Integer> getCandidateCollection(Map<String,Integer> itemkFcMap){

Map<String,Integer> candidateCollection=new HashMap<String,Integer>();

Set<String> itemkSet1=itemkFcMap.keySet();

Set<String> itemkSet2=itemkFcMap.keySet();

for(String itemk1:itemkSet1){

for(String itemk2:itemkSet2){

//进行连接

String[] tmp1=itemk1.split(ITEM_SPLIT);

String[] tmp2=itemk2.split(ITEM_SPLIT);

String c="";

if(tmp1.length==1){

if(tmp1[0].compareTo(tmp2[0])<0){

c=tmp1[0]+ITEM_SPLIT+tmp2[0]+ITEM_SPLIT;

}

}else{